An essential part of a development project is good documentation.
Motorola provides very nice documentation on the 68HC11 and 68HC12
microcontrollers. Some of their documentation is available on the web,
including their "pink books"; a must-have for 68HC11 programming.
I have also written and collected 68HC11 tool (AS11 and PCBUG11)
documentation, plus the details on the S19 fiole format (compiled
via conversations and code provided by Randy Sargent). I also
include a copy of the hard-to-find manual for PCBUG11--I
actually have a Motorola-produced hardcopy of a PCBUG11 manual!
In the process of teaching college-level microprocessor and microcontroller
classes I have found a few good texts which I highly-recommend.

I hope these references are as beneficial to you as they have been
for me.

68HC11 Tool Documentation

botboard1.pdf - Version 1.03
of the BOTBoard manual, with annotations by Kevin Ross.